Latch with lock dogging means



1952 R. LEVANE LATCH WITH LOCK noccmc MEANS Filed May 16, 1950 Inventor Rose/er. Arm/vs MLQ. 4

A ftorn e y Patented Dec. 9, I952 UNITED STATES PATENT OFFICE 2,620,645 LATCH WITH LOCK DOGGIN G MEANS Robert Levane, London, England Application May 16, 1950, Serial No. 162,263 In Great Britain May 23, 1949 3 Claims.

This invention relates to looks and has reference particularly to door latching locks of what is generally known as the Yale type provided with means for positively locking the handle or knob. The invention is concerned with the construction of locking mechanisms which will preclude the possibility of the lock being operated either from the inside or the outside of the door except by the use of the appropriate key.

In accordance with the invention I provide the member inside the lock casing, which is operated by the turning of the knob or handle of the lock, with a recess in which a slidable locking bar is located when the locking mechanism is in operation.

This sliding locking bar runs through a passage in a block which, when the key is inserted, is completely unobstructed so that the locking bar can move freely within the limits of movement provided.

Removal of the key, however, results in the passage becoming automatically obstructed at one or more positions so that the slidable locking bar cannot be moved and the invention consists broadly of mechanism for dead looking a lock comprising a recessed element associated with the operating knob or handle of the lock, a looking bar adapted to be projected into locking engagement with the recessed element, said looking bar having at least one hole in it, a spring actuated piston like composite obstruction element disposed at right angles to said locking bar normally locking said locking bar against movement, said composite element consisting of three abutting component parts, the intermediate one of which being of the same dimensions as the hole in the looking bar, all the component parts being in alignment one with the other and with the hole in the locking bar and removable means operable to position the components of the composite obstruction element so that its intermediat component occupies the hole in the locking bar whereby the locking bar is freed to be slidden into and out of engagement with the recess of the element to be locked.

More specifically the invention consists of mechanism'for dead locking a latch lock comprising a slidable locking bar adapted to he slid-- den into and out of locking engagement with the actuating element of the lock, said locking bar being provided with holes through it, a block located within the lock casing and having a passage in which said lockin bar can slide, piston like spring actuated composite obstruction elements slidable in the block at right angles to the locking bar in alignment with holes in the locking bar, each of said composite obstruction elements consisting of three component parts, one of which when the locking bar is operable, is located above the locking bar, one is located below the locking bar and an intermediate one fills a hole in the locking bar, whereby when an. appropriately profiled key is inserted through the casing of the look below the lower ends of the composite obstruction elements it positions all the intermediate components of said composite elements in their appropriate holes in the locking bar to free the locking bar for operation. a

In order that the invention may be readily understood reference is hereby made to the accompanying drawing, wherein:

Figure 1 is a sectional view showing an example of the improved locking mechanism with the locking bar in looking position but free to be withdrawn from its locking position,

Figure 2 is a view similar to Figure 1, with the key removed,

Figure 3 is an end elevation of Figure 2 looking in the direction of the arrow A, and m Figure 4 is a plan of Figure 1 with the control key removed and the locking bar in position dead locking the lock and no longer capable of being moved itself.

Referring to these drawings the numeral 1 designates the lock casing and the numeral 2 the element of the lock which is actuated by the knob 3 of the lock in the usual way to withdraw the latch of the lock against its usual spring. Within the casing I a block 4 is mounted and this block is provided with the three borings 5 in which are located piston like obstruction elements each of which consists of three component parts. That is to say each consists of a top component 6, which is subject to the influence of a compression spring I, a lower component part 8 and an intermediate component part 9. The in termediate component parts 9 are of the same dimensions as holes provided in a locking bar l0 which is capable of sliding through an opening ll cut in the casing wall and in a passage I2 aligned therewith cut in the block 4 at right angles to the composite obstruction elements 6, 8, 9. In the lower part of the block 4 a key way [3 is provided and in Figure l a key M is shown in position in the key way. The insertion of this key operates cam fashion on the noses 8a of the lower component parts of the obstruction elements and the profile of the key is such that when it is in the inserted position shown all the intermediate components 9 of the obstruction elements are in alignment and occupy the holes in the locking bar It. Thus in this position no obstruction is offered to the locking bar and it can be slidden in and out within the limits of its movement. In Figure 1 it is shown in its position with its end Hia projected into the recess 2a of the actuating element 2 of the lock. Thus the lock is dead locked when the locking bar is in the position shown. While the keyremains in the lock-the locking bar H] can, of course, be moved outwardly to free the look again. In

Figure 2, however, th position is shown after the key has been removed and it will beobserved that the springs '7 have pressed their composite obstruction elements down so that their noses lie in alignment on the base or platform I5 and in this position it will be seen the top components .6 have passed through the holes in the'locking bar l0 thus looking it against displacement. When it is desired to remove the dead lock the key is inserted and the position shown in Figure 1 restored whereupon the locking .bar Lil can be with-, drawn and the dead lock removed leaving the lock free to be operated by the knobv or handle 3 of the lock in the normal way.

This dead locking only affects the knob operation, the operation of the lock by the key from outside the door being efiected in the usual way, the key .operatinga separate latchaotuating element similar to the (element 2 but, of course, without the recess 2a.

Invaddition to the locking bar obstruction elements before described there may be provided a fourth or additional intermediate element 9a located in a .fourth or additional hole in the locking bar so arranged that the locking ,bar can be locked in a secondary position where the locking bar is disengaged from the-knob or handle operated element of the look. This additional element is positioned so that if the locking ,bar is pulled out of locking engagement it becomes the intermediate member of the rearmostcomposite obstruction element, the intermediate. member of which becomes the intermediate member of the next locking bar obstruction elementof the series and the intermediatemember of the ioremost or final locking bar obstruction element of the series passes to an inoperative position.

Thus the invention providesior two, dead lock DQsitions which both depen upon, the insertion of th p mpr atek y to ffe t unlockin A look having ,mechanism of the. foregoing character provides security in cases Where the ock i pl d to s as pa rs and moreover precludes burglarsfrom entering bya win,- dow and then slipping out by the door.

Although primarily designed as a means for deadlocking the operating mechanism of ordinary locks in the manner described in the example illustrated it will be understood that the locking bar may itself constitute a dead locking mechanism. That is to say the sliding bar can itself operate as a bolt which when a keyis positioned can "be slidden into locking position, re-

.movalof the key dead locking the bolt.

What is claimcd is:

1. Ina latch lock operable by actuation oi a knob, a mechanism for dead locking said lock comprising a latch actuating element, a slidable locking bar adapted to be sl-idden into and out of locking engagement with the latch actuating element, saidlocking bar being provided with 4 holes through it, a lock casing, a block located within the lock casing and having a passage in which said locking bar can slide, piston like spring actuated composite obstruction elements slidable in the block at right angles to the locking bar in alignment with holes in the locking bar, each of said composite obstruction elements consisting of three component parts one of which when the locking bar is operable is located above the locking bar, one is located below the locking bar and an intermediate one fills a hole in the locking bar, said lock casing including a slot adapted to receive an appropriately profiled key, whereby when said key is inserted through the slotinto the casing of the look so as to be located below the lower ends of the composite obstruction elements it positions all the intermediate components of said composite elements in their appropriate holes in the locking bar to free the locking bar for operation.

2. Latch look according to claim wherein an additional intermediate component is provided in an additional hole in the locking bar positioned so as to be capable of replacing the intermediate component of the adjacent composite obstruction element whereby the locking bar can be locked in a secondary position.

3. A latch lock comprising, in combination, a latch actuable by a knob, a casing, an element within the casing actuable by the knob whose movement operates. the latch and including a recess, a flat slidable locking bar having a hole through it, said locking ,bar being adaptedto engage at one end in said recess to lock the ele ment against movement by the knob, a block through which said locking bar slides having a holev in it disposed at right angles to said locking bar and aligned with the hole in said locking bar, a spring actuated piston-like composite obs true; tion element slidable in said hole and passing through the aligned hole in said locking-bar-, said composite piston element having three components consisting of an intermediate cemponent corresponding to the size of the hole, said ck ba a ng p e d c mp entj bu ti said intermediate component at one end, and-a continuation component abutting against, the otherend of said intermediate component, saidcasing being .formedwitha key slot into dvhich the continuation component extends, the an.- ransem ng such h e i termediate component fills thehole. in the lockingbar se as to permitmovementof the locking bar only when akey isepositionedinthe keyslot. I

. ROBERT REFERE CE TE Th f l n r fe e ce a e of, r co d. ixtlw file of this; patent;

UNITED. STATES PATENTS umbe Name .Da

96 1 02 Gumbel. N V-.16, 156$ 219,077 Boner r ,-,-,r -.-.-r.- Sep 2.11 913,357 Madolski -Apr. 19,09 924,528 Arens June 3,1909 967,066 Schwob Aug. e,',1 e1 o 1,083,483 Deibert Jan. 6, 111914 i oseoez -Grand-its f Jan. 13,1914 1,169,541 Hurd Jan. as, 1916 1,309,439 Keefer V -Ju1 8, 19-1-9 2,024,497- Alberti Dec: 17,1935 

